外研社选修8课文英文版
29页1、-必修8Module 1Deep SouthAntarctica: the Last ContinentAntarctica is the coldest place on Earth. Its also the driest. With annual rainfall close to zero, Antarctica is technically a desert. Covering about 14 million square kilometers around the South Pole, it is the fifth largest continent in the world. A high mountain range, the Trans-Antarctic range, runs from east to west, cutting the continent in two. There are volcanoes too, but they are not very active. Antarctica holds 90% of the worlds ice,
2、 and most of its fresh water (70%) is in a frozen state, of course. 98% of the surface is covered permanently in the ice cap. On average it is two kilometers thick, but in some places it reaches a depth of five kilometers. Strong winds driven by gravity blow from the pole to the coastline, while other winds blow round the coast. It is difficult to imagine a more inhospitable place. Yet Antarctica is full wildlife, which has adapted to its e*treme conditions. There are different types of penguins
3、, flying birds, seals, and whales. But the long Antarctic winter night, which lasts for 182 days (the longest period of continuous darkness on earth), as well as the e*treme cold and lack of rainfall, means that few types of plants can survive there. Only two types of flowering plants are found, while there are no trees on the large continent. The rest of the plants are made up of mosses, algae and lichen. Some forms of algae have adapted to grow on ice.Most of the ice has been there for thousan
4、ds of years. As a result, it has bee a window on the past, and can give researchers lots of useful information. Gases and minerals, in the form of volcanic dust trapped in the ice, can tell us a lot about what the worlds climate was like in past ages. Antarctic rocks are also very important for research. Most of them are meteorites from outer space. One rock, known as the “Alien rock, may contain evidence of e*tra-terrestrial life.Since most Antarctic rocks are dark in colour, they stand out aga
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